The gist of your message is quite right. I don't know if keeping the documents classified is the right or wrong decision, but a type of "statute of limitations" needs to apply to countries just as it does to individuals. Present day America isn't pre-Civil War America, China is no longer Mao's China, etc...and I would hate to be held responsible for my actions in my youth.
Magnitude 5.2 earthquake hits central Iran (Reuters)
from the article: A state afraid of its past